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Process independent Bias Current Generation (Read 2803 times)

despap Junior Member Offline Posts: 18	Process independent Bias Current Generation Jun 24^th, 2010, 11:40pm What is the best way to generate a process independent bias current, given that extenral resistor is not available and very accurate bandgap reference is available( untrimmed 6sigma of 2.5%). Thanks for any help.
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: Process independent Bias Current Generation Reply #1 - Jun 28^th, 2010, 2:06am hi, where you need such high accuracy? Thanks.
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despap Junior Member Offline Posts: 18	Re: Process independent Bias Current Generation Reply #2 - Jun 28^th, 2010, 2:25am I need bias current accurate to +/- 10% .. and i have bandgap ref of 2.5%6 sigma accurate.
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Vladislav D

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The Netherlands

Re: Process independent Bias Current Generation
Reply #3 - Jun 28^th, 2010, 11:32am

despap wrote on Jun 24^th, 2010, 11:40pm:

What is the best way to generate a process independent bias current, given that extenral resistor is not available and very accurate bandgap reference is available( untrimmed 6sigma of 2.5%).
Thanks for any help.

I think, no ways to design current source independed on corners without trimming or offchip resistors. Furthermore, I don't see a reason to do such sources. It may be even dangerous if all devices go in one direction due to a corner,whereas a current source keeps a constant value of current. A circuit might leave the "right" bias. What really need is to keep low variations due to statististical mismatches.

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